Rezista Mainspring #293 for ETA 640 & Benrus M - Steel

Rezista Mainspring No. 293 for Benrus caliber M and ETA caliber 640 movements plus perhaps others, new in envelope. See images for precise mainspring specifications. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.